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Implement these on BackgroundFetchRegistration, which is, in turn, exposed on
all Background Fetch events surfaced to the developers.

Bug: 863016
Change-Id: If6406b800b595df285d7304652948063c80ac45b
Reviewed-on: https://chromium-review.googlesource.com/1177394
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584826}